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GRINDING MACHINE. APPLICATION FILED MAR. l5. i917. gupggwm l Patented Deo. 11,1917.V

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H. n. usLER.

GRINDING MACHINE.

APPLICATION FILED MAH. l5. 1917.

1,491,632. l K Patented me.. 11,191?.

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@vw @Mm Mmmm (Mm @dwg ma www? H. R. ISLER.

GRINDING MACHINE.

APPLICATION FILED MMI. '15. Isn.

L24932. I Patented Ine. 11,1917.

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Application filed Maren 15, 1917. Serial No. 155,674.

To all 'whom t may concern? Be it known that i, Henman R. lenen, a citizen of the United States, and a resident of Norwood, in the county of Hamilton and State of hio, have invented certain new and internal grinding, 'a slow screw feed is de-` sirable. For other Aclasses Aof work, as for in stance in sharpenin,`-` g4l cutters, a quick lever feed is preferablle.

@ne of the uobjects of my invention is to provide mechanism for both screw and Mracllr or lever feeds "of simple, efficient and iiieiipensive construction.

di further object lof my invention is to provide in a grinding machine, the table of which has both screw and raclor lever feeds, means whereby the screw feed may be dis engaged.

d. further object of my invention is to provide combined feed mechanism for the `tahle of a grinding machine so constructed as to permit convenient operation "from various parte of said machine.

Further objects of *my invention will ibe obvious from the following specification thereof, talrenin connection with Vthe accompanjving drawings, wherein one embodiment of the principle of my iinv'ention is particu larly disclosed lin lthe drawings:

ligure iis a frontelevationofla grinding machine constructed in accordance withiny invention.

Fig. 2 is a plan viewof said machine, .part being broken aivajv 'for the salie of clearness.

hier. 3 is a detail longitudinalsection `of the feed mechanism. Fig. 4C is a detail cross sectionoffsaid feed mechanism..

ifi 5 is "an `elevation of one of the threaded "iaws p lliipg. o is a crossseetiiin.ftalenfon theline "tl-dof @Figa 5. e p

Y "titeuarellevetunofthetam hitch.

Fig. 8 is an end view of said cam block.

Fig. 9 is a perspective ofga .portion of the bushing showing` the shoulders for limiting the rotation of thecam bloclr.

lThe numeral l indicates the standard or column of a grinding' machine on the top of which is a head `.Q forthe grindingspindle 3. Mounted on said column is an adjustabie knee Il which carries the usual table 5, the latterv being adjustable tio bring work `supported between the headstoc1r t and tail-` stock 7, in conjunction with adjustments of the knee, into Aposition to he `operated upon by a grinding wheel `meundted on the spindle 3. A shaft 8 is journaled in hearings in the saddle of the lrnee din the usualm-ahnerand has rigidly secured to it a spur wheel 9 which isarran-ged to engage a raclr bar l() secured to the underside of the table 5. An operating lever 1l is provided for the ends of the shaft 8. i i

Rotatahly mounted in bearings `1Q `at the ends of the table and on the underside there of, is a shaft i3, the said shaft being prou vided with a threaded portion 1d. One end of said shaft is provided with a ha-nd wheel 1,5 `for the operation thereof. rlhe saddle of the knee i is provided with a `bore within which a bushing 16 is secured. lliotatabljv mounted in said hushingis `a shaft 17, the inner en-d of said shaft being journaled in a bearing-loflone of the `jaws hereinafter deM scribed. Secured to the outer end of the shaft i7 is an operating lever i9. `h/liounted on the shaft 1'( and secured thereto by `means of a screw 20 :is a cylindrical cam block-2i provided with obliqueslots or cam surfaces 22. Theinner end of the Vbushing-16 is cut away to forin shoulders against whichua pin Qawsecured in the end of the hiock 2l is arranged to strike during the rotation of the shaft l?, thus limiting the movements of the shaft and )block `2l for the purpose hereinafter mentioned. Mounted in the frame of the linee flat opposite sides of the `shaft 17 are rods slidahly mounted on the `said rods are "threaded aws "26p, the `said aws "beino located `on opposite sides `of the `threaded portion 1li `of the shaft 13. The lower :portions of the jaws `26 are cut away `as shown 1415 at `E27 `to `prdvide clearance for the block Secured `in the undersideof each of the jaws is a `pin 12S; the said `pins are arranged to engage-respectivelyin `the slotsiEQ of the hloelr di.. The threaded portions di) ofthe .jaws une its use on either end of said shaft for the operation of the rack feed.

The above described mechanism, as will be seen, provides for Aboth screw and rack feeds of the table, the screw vfeed operating by the engagement of the threaded portions 29 of the jaws 26, with thread 14 of the shaft 13. The engagement of the jaws with the thread 14 -is effected by the rotation of the shaft 17 and cam block 21, the jaws being caused to slide upon the rods 25 by reason of the engagement of the pins 28 in the slots 22 of the cam block. Movement of the cam block inl one direction, by bringing converging portions of the slots Q2 to bear upon the pinsQS, causes the jaws 26 to engage the thread 14. Conversely, movement of the block 21 in the opposite direction causes the jaws to open, thus releasing the shaft 13. The pin 24 by striking against the shoulders h23 limits the ,movement in either direction of the jaws, and thus prevents said jaws from gripping the shaft too tightly, and binding. Vhen the jaws are thus open and the shaft 13 released, the rack feed by means of the gear 9 and rack 10 may be used. It will 4further be seen that by the arrangement ofoperating means for the shafts 8 and 18, the feed mechanism for the table may be operated at various convenient points.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a grinding machine, the combination with the table of said machine, of feed mechanism for said table, said mechanism comprising fa rotatably mounted threaded shaft, movably mounted engaging means, one of said elements being mounted on said table and the other on the. support therefor, means for the rotation of said shaft, a block rotatably mounted adjacent said engaging means, said block being provided with cam surfaces, means on said engaging means arranged to engage said cam surfaces whereby upon the rotation of said block, said engaging means may be caused to engage or disengage said threaded shaft, substantially as and for the purpose described.

2. In a grinding machine, the combina- -tion with thetable of said machine, of feed mechanism for said table, said mechanism comprising a rotatably mounted Ythreaded shaft, movably mounted threaded jaws, one

of said-elements being mounted on said table and the other on the support therefor, means for the rotation of said shaft, a block rotatably mounted adjacent said threaded jaws, said block being provided with cam surfaces, means on said threaded jaws arranged to engage said cam surfaces whereby upon the rotation of said block, said threaded jaws may be caused to engage or disengage said threaded shaft, substantially as and for the purpose described.

3. In a grinding machine, the combination with the table of said machine, of feed mechanism for said table, said mechanism comprising a rotatably mounted threaded shaft, movably mounted threaded jaws, one of said elements being mounted on said table and the other on the support therefor, a block rotatably mounted adjacent said jaws, said bloclr being provided with cam surfaces, means to limit the rotation of said block, and means on said jaws arranged to engage said cam surfaces, whereby upon the rotation of said block, said jaws may be caused to engage or disengage said threaded shaft. substantially as and for the purpose described.

4. In a grinding machine, the combination with the table of said machine, of feed mechanism for said table, said mechanism comprising a threaded shaft rotatably mounted on said table, rods mounted on the support for said table, threaded jaws slidably mounted on said rods, a shaft rotatably mounted in said support between said rods, a block secured to said shaft adjacent said jaws, said block being provided with cam surfaces and means on said jaws arranged to engage said cam surfaces whereby upon the rotation of said block, said jaws may be caused to engage or disengage said threaded shaft, substantially as and for the purpose described.

5. In a grinding machine, the combination with the table of said machine, of feed mechanism for said table, said mechanism comprising a threaded shaft rotatably mounted on said table, rods mounted on the support for said table, threaded jaws slidably mounted on said rods, a shaft rotatably mounted in said support between said rods, a block secured to said shaft ad jacent said jaws, said block being provided with cam surfaces, means to limit the rotation of said block, and means on said jaws arranged to engage said cani surfaces, whereby upon the rotation of said block, said jaws may be caused to engage or discngage said threaded shaft, substantially as and for the purpose described.

6. In a grinding machine, the combination with the table of said machine, of feed mechanism for said table, said mechanism comprising a rack bar, a gear, one of Said elements being mounted on said table and the other on the support therefor, means for the rotation of said gear to operate said table, a rotatably mounted threaded shaft, moi/ably mounted engaging means, one of said elements being mounted on said table and the other on the support therefor, means for the rotation of said shaft, and means whereby said engaging means may be caused to disengage said threaded shaft, substantially as and for the purpose described.

7. In a grinding machine, the combination with the table of said machine, of feed mechanism for said table, said mechanism comprising a rack bar, a gear, one of said elements being mounted on said table and the other 0n the support therefor, means for the rotation of said gear to operate said table, a rotatably mounted threaded shaft, movably mounted threaded jaws, one of said elements being mounted on said table and the other on the support therefor, means for the rotation of said shaft, a block rotatably mounted adjacent said threaded jaws, said block beingprovided with cam surfaces, means on said threaded jaws arranged to engage said cam surfaces, Whereby, upon the rotation of said block, said threaded jaws may be Caused to engage or disengage said threaded shaft, substantially as and for the purpose described.

HERMAN R. ISLER.

Montes of this patent may be obtained for ve cents each, by addressing;` the Commissioner of Patents. Washington, D. C. 

